--- qucs-core/configure.orig	2011-07-03 07:34:09.069218113 -0500
+++ qucs-core/configure	2011-07-03 07:34:46.618990497 -0500
@@ -5884,7 +5884,6 @@
 
  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#include <tr1/complex>
 using namespace std;
 using namespace std::tr1;
 int
